Fabrication of low firing piezoelectric ceramics and their applications

The Low-firing PZT, PNN-PZT, PMN-PNN-PZT systems piezoelectric ceramics with high performance have been studied systematically. By doping suitable additives and optimizing processing, excellent piezoelectric properties could be obtained: Kp=0.50∽0.74, d33=(300∽705)×10−12C/N, ϵ33 T /ϵ0 =800∽4100, tanδ=(40∽250)×10−4. The microstructure and the mechanism of transition liquid phase sintering were also investigated. The low firing piezoelectric ceramics have been used for multilayer piezoelectric transformers, ultrasonic motors and thick film devices.